//
//  WSLNavigatioController.m
//  TransferAnimation
//
//  Created by 王双龙 on 2018/4/7.
//  Copyright © 2018年 https://www.jianshu.com/u/e15d1f644bea All rights reserved.
//

#import "WSLNavigatioController.h"

@interface WSLNavigatioController () <UIGestureRecognizerDelegate>

@end

@implementation WSLNavigatioController

- (instancetype)initWithRootViewController:(UIViewController *)rootViewController{
    
    if (self == [super initWithRootViewController:rootViewController]) {
        
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor =[UIColor clearColor];
    
    // 获取系统自带滑动手势的target对象
    id target = self.interactivePopGestureRecognizer.delegate;
    // 创建全屏滑动手势，调用系统自带滑动手势的target的action方法
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:@selector(handleNavigationTransition:)];
    // 设置手势代理，拦截手势触发
    pan.delegate = self;
    // 给导航控制器的view添加全屏滑动手势
    [self.view addGestureRecognizer:pan];
    // 禁止使用系统自带的滑动手势
    self.interactivePopGestureRecognizer.enabled = NO;
}

#pragma mark -- UIGestureRecognizerDelegate

// 什么时候调用：每次触发手势之前都会询问下代理，是否触发。
// 作用：拦截手势触发
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    // 注意：只有非根控制器才有滑动返回功能，根控制器没有。
    // 判断导航控制器是否只有一个子控制器，如果只有一个子控制器，肯定是根控制器
    if (self.childViewControllers.count == 1) {
        // 表示用户在根控制器界面，就不需要触发滑动手势，
        return NO;
    }
    return YES;
}




- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
 #pragma mark - Navigation
 
 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

@end
